Research Triangle Park, N.C. — Two weeks ago, IBM committed $1 billion to cost-cuts and "rebalancing" of its work force as revenues continue to decline. Then came news of its x86 server unit with some 7,500 workers to Lenovo. But that deal won't close for months - if at all. Now a Wall Street analyst has run the numbers and sees Big Blue cutting 13,000 jobs. A $1 billion plan a year ago cut more than 3,500 jobs in North America alone. Meanwhile, unions seeking to represent IBMers in the U.S. and around the world say they believe IBM will cut 15,000....